Hockey Puck SIT 2SK180 by Tokin source NOS

The same package but Shindengen brand transistor attention not SIT
Next picture is about used Tokin after the NOS be not available in the future we can find used part's ;)
 

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What is the proper nomenclature of the big TO-3 package?

No source of information about package in Tokin datasheet.
Maybe this is the reason Mr. Pass call them Hockey Pucks :D
Tokin ( Tohoku Metal Industries Co. ) is no longer with NEC, actuall name is Tokin a Kemet Company.
BTW sellers Pras and Watanabetomoaki have still full boxes
 

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Can anyone suggest why most of the designs for SITs use the op devices in follower (common drain) mode ? Other than some of the single stage types I mean. In follower mode, they operate with full local feedback so *possibly* a bit of a missed opportunity to enjoy the most of their their triode-y transfer characteristic ?

Perhaps Nelson can chime in also since he would have tried them in every configuration know to man (and then some...)
 
Pass DIY Apprentice
Joined 2001
Paid Member
Hi Kasey,

At one time I thought CS was the only way to go with SITs, but I'm becoming more liberal in my old age.

Common Source applications are attractive and fun in the sense that they are analogous to how big Triodes are generally used in output stages. However, SITs as followers have their merits as well, and one could certainly argue that they are more "triodey" with some form of voltage feedback applied. Depends on what you're after.

I'm just pointing out that, SITs in followers, or even (heaven forbid) CS with some voltage loop feedback needn't be dismissed out of hand. They have a place in our toolbox, and I wouldn't want to spoil anyone's fun or creativity with audiophile mythology. :)